Dachshund itchy belly after second dog adoption

Skin allergies are honestly one of the most frustrating things to deal with as a dog owner — they're chronic, genuinely difficult to pin down, and usually need attacking from more than one angle. The critical first fork in the road is working out whether the trigger is environmental or food-related, and that gets more complicated when a new dog has recently joined the household and brought different food into the mix. So — what breed and age is your dog, what symptoms are you seeing, is it seasonal, and have you had a chance to speak to a vet yet?

The timing is really telling here. Six weeks ago a new dog arrives with different food, and within that same window your Dachshund starts scratching his belly — that's not a coincidence I'd ignore. The most likely culprit is food cross-contamination: your older dog is either sneaking bites of the new dog's food, or picking up crumbs from her bowl area. Dachshunds can be quite food-opportunistic. Before I point you toward anything, can I ask — are you feeding them in the same room, and have you noticed him near her bowl at all? Also, is the itching constant through the day or worse after mealtimes?

Right — worse in the evenings, after feeding, and you've confirmed he's eating her food. That's a textbook pattern for a food sensitivity reaction. The redness and inflammation without broken skin suggests an immune response rather than a parasite or infection, which is reassuring for now. Two things need to happen in parallel. First, feed them separately — different rooms, pick up bowls immediately after eating. That removes the variable. Second, while you're doing that, you need something to calm the existing inflammation and stop the itch-scratch cycle, because the scratching itself can break the skin and lead to secondary infections. For that, I'd recommend Piriton — the plain chlorphenamine 4mg tablets. They're an antihistamine, widely used for dogs, and safe for a dog his size at half a tablet once or twice daily. It won't fix the underlying food issue, but it'll take the edge off while you work out the trigger and before you get to a vet.

Yes — chlorphenamine, which is what plain Piriton contains, is one of the antihistamines vets commonly recommend for dogs and has a good safety record. The key word is plain Piriton: the standard 4mg tablets, not Piriton Allergy or any version with added decongestants or other active ingredients, as those can be harmful to dogs. For an 8-year-old Dachshund — typically around 8 to 12kg — half a tablet once or twice a day is the standard guidance. That said, do check with your vet when you go, and don't use it long-term without that conversation. It's a short-term calming measure while you sort the feeding situation, not a permanent fix. The permanent fix is separating the food.

Not yet — and this is important. If you change food at the same time as separating feeding, you won't know which change made the difference. Separate them first, give it two to three weeks, and watch whether the itching settles. If it does, you've found your answer: he was reacting to her food. If it doesn't settle after proper separation, then a food trial with a hypoallergenic or novel protein diet becomes the logical next step — but that's a conversation to have with your vet, who can also rule out environmental allergies, mites, or contact irritants. For now: separate feeding, plain Piriton 4mg half a tablet to manage the itch, and book a vet appointment so they can look at the belly and confirm there's no secondary skin infection developing.